Proto-IE: *(s)k'oun-
Meaning: quick, dashing, beautiful
Hittite: iskunant- 'fleckig, schmutzig' (Tischler 404)
Celtic: Cymr cun `anziehend, liebenswürdig'; Gaul EN. Counos; OIr Cuan, cuan-dae `schön, angenehm'
Russ. meaning: приятный во всех отношениях
References: WP I 365 f [quite differently in Pok.]